Fraxinus, commonly called ash, is a genus of flowering plants in the olive and lilac family, Oleaceae. It contains 45–65 species of usually medium to large trees, mostly deciduous, though a number of subtropical species are evergreen. The genus is widespread across much of Europe, Asia, and North America.
Ash trees are special because they can restore natural systems. They readily colonize riparian areas where their roots help stabilize stream banks, their leaves feed both aquatic and terrestrial ecosystems, and their branches provide shade and nesting sites for many animals.